P6 or P4?

hey, I need your advices and your comments.
Need to choose between p6 and p4.
I am sure that P4 will be more interesting for me, but the problem arise how much useful P6 is.. Isnt it too complicated, so that only the deep taxation specialist will find it useful? For the other will be just much struggling with old taxation rules? Please advice…Generally I like taxation, I am just afraid that would be too elaborated, so 80% of that I have studied in most of the cases will never practise..